3897621 has 24 divisors (see below), whose sum is σ = 6930560. Its totient is φ = 2055456.

The previous prime is 3897611. The next prime is 3897631. The reversal of 3897621 is 1267983.

3897621 = T₂₄₆ + T₂₄₇ + ... + T₃₃₆.

It is an interprime number because it is at equal distance from previous prime (3897611) and next prime (3897631).

It is not a de Polignac number, because 3897621 - 2¹⁰ = 3896597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1561 + ... + 3198.

Almost surely, 2^3897621 is an apocalyptic number.

It is an amenable number.

3897621 is a deficient number, since it is larger than the sum of its proper divisors (3032939).

3897621 is a wasteful number, since it uses less digits than its factorization.

3897621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785 (or 4782 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3897621 is about 1974.2393471917. The cubic root of 3897621 is about 157.3740792478.

The spelling of 3897621 in words is "three million, eight hundred ninety-seven thousand, six hundred twenty-one".